Hydrazine hydrate (1:1) → Methyl 3-(2-bromophenyl)-1H-pyrazole-5-carboxylate
反応式
[Br:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[C:8](=O)[CH2:9][C:10](=O)[C:11]([O:13][CH3:14])=[O:12].O.[NH2:18][NH2:19]>CC(O)=O>[Br:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[C:8]1[CH:9]=[C:10]([C:11]([O:13][CH3:14])=[O:12])[NH:19][N:18]=1参加物
4
反応条件
- 温度
- 130 °C
実験手順
To a solution of methyl 4-(2-bromophenyl)-2,4-dioxobutanoate (540 mg, 0.0019 mol) in AcOH (4 mL) was added hydrazine monohydrate (67 mg, 0.00208 mol). The reaction mixture was allowed to stir at 130° C. overnight and then concentrated. The residue was dissolved in EtOAc, washed with aq. NaHCO3 and brine, dried over Na2SO4, filtered and concentrated to give methyl 3-(2-bromophenyl)-1H-pyrazole-5-carboxylate (0.516 g, 97%) as a white solid. LCMS: (FA) ES+ 283.2, ES-281.2.